2011/04/30 by Thomas Konstandin, Geraldine Servant, Géraldine Servant · 1 citation
Computer Science · Physics and Astronomy · #Baryogenesis #Baryon asymmetry #Computational Physics and Python Applications #Electroweak interaction #Higgs boson #Neutrino Physics Research #Particle physics theoretical and experimental studies #Spontaneous symmetry breaking #Standard Model (mathematical formulation) #Symmetry breaking #Technicolor #hep-ph
paper · pdf · doi:10.1088/1475-7516/2011/07/024
published as JCAP07(2011)024 · 20 pages, 5 figures; v2: One figure and some minor clarifications were added, results unchanged, version published in JCAP
openalex publication_date 2011/07/19 · arxiv created 2011/07/21 · arxiv updated 2015/05/28 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The mechanism of ``cold electroweak baryogenesis'' has been so far unpopular because its proposal has relied on the ad-hoc assumption of a period of hybrid inflation at the electroweak scale with the Higgs acting as the waterfall field. We argue here that cold baryogenesis can be naturally realized without the need to introduce any slow-roll potential. Our point is that composite Higgs models where electroweak symmetry breaking arises via a strongly first-order phase transition provide a well-motivated framework for cold baryogenesis. In this case, reheating proceeds by bubble collisions and we argue that this can induce changes in Chern-Simons number, which in the presence of new sources of CP violation commonly lead to baryogenesis. We illustrate this mechanism using as a source of CP violation an effective dimension-six operator which is free from EDM constraints, another advantage of cold baryogenesis compared to the standard theory of electroweak baryogenesis. Our results are general as they do not rely on any particular UV completion but only on a stage of supercooling ended by a first-order phase transition in the evolution of the universe, which can be natural if there is nearly conformal dynamics at the TeV scale. Besides, baryon-number violation originates from the Standard Model only.